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patterns/ico: Add embedded BMP and PNG parsing to ICO pattern (#426)

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Co-authored-by: Nik <werwolv98@gmail.com>
This commit is contained in:
Ivy Fan-Chiang
2025-08-31 08:32:21 -04:00
committed by GitHub
parent d95390ea42
commit fb214600ec
1 changed files with 46 additions and 19 deletions
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65
patterns/ico.hexpat
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@@ -4,6 +4,10 @@
#pragma endian little
import std.sys;
import std.mem;
import std.string;
import * from bmp as BMP;
import * from png as PNG;
#pragma MIME image/vnd.microsoft.icon
#pragma MIME image/x-icon
@@ -13,38 +17,61 @@ import std.sys;
#pragma MIME application/ico
enum ImageType : u16 {
Icon = 1,
Cursor = 2
Icon = 1,
Cursor = 2
};
struct ICONDIR {
u16 reserved [[hidden]];
ImageType type;
u16 num_images;
u16 reserved [[hidden]];
ImageType type;
u16 num_images;
};
struct BMPData {
u8 data[sizeof(parent.data)] [[hidden, no_unique_address]];
std::mem::Section section = std::mem::create_section("BMP Image " + std::string::to_string(addressof(this)));
std::mem::set_section_size(section, sizeof(data) + 14);
u8 headerData[14] @ 0x00 in section [[hidden]];
headerData[0x00] = 0x42;
headerData[0x01] = 0x4D;
u32 size @ 0x02 in section [[hidden]];
size = std::mem::get_section_size(section);
std::mem::copy_value_to_section(data, section, 0x0E);
BMP image @ 0x00 in section;
u32 offset @ 0x0D in section [[hidden]];
offset = addressof(image.lineData);
};
struct ImageData {
u8 data[parent.image_data_size] [[inline]];
std::mem::Bytes<parent.image_data_size> data [[no_unique_address]];
be u64 png_magic [[hidden, no_unique_address]];
if (png_magic == 0x89504e470d0a1a0a) {
PNG png_image @ $ [[inline, highlight_hidden]];
} else {
BMPData data [[hidden]];
BMP bmp_image @ addressof(this) - 14 [[inline, highlight_hidden]];
}
};
struct ICONDIRENTRY {
u8 width, height;
u8 num_colors;
u8 reserved [[hidden]];
u8 width, height;
u8 num_colors;
u8 reserved [[hidden]];
if (header.type == ImageType::Icon) {
u16 color_planes;
u16 bits_per_pixel;
} else if (header.type == ImageType::Cursor) {
u16 horizontal_hotspot_coordinate;
u16 vertical_hotspot_coordinate;
}
if (header.type == ImageType::Icon) {
u16 color_planes;
u16 bits_per_pixel;
} else if (header.type == ImageType::Cursor) {
u16 horizontal_hotspot_coordinate;
u16 vertical_hotspot_coordinate;
}
u32 image_data_size;
ImageData *image_data : u32;
u32 image_data_size;
u32 image_data_offset;
ImageData image_data @ image_data_offset;
};
ICONDIR header @ 0x00;
ICONDIRENTRY images[header.num_images] @ $;
std::assert(header.reserved == 0x00, "Invalid ICO header");
std::assert(header.reserved == 0x00, "Invalid ICO header");